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P/NO : 3828VD0104L
Sep.,2001
Printed in Korea
COLOR TV
SERVICE MANUAL
CHASSIS : MC-019A
MODEL : CF-20/21S11KEX
MODEL :
CF-20/21T20K/20T22KX
MODEL :
CF-20K51KEX
MODEL :
CF-20/21F60K/KX
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
NATVRAL
EYE
ALGORITHM
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html
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Related Manuals for LG CF-20S11KEX
Summary of Contents for LG CF-20S11KEX
- Page 1 website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html COLOR TV SERVICE MANUAL CHASSIS : MC-019A MODEL : CF-20/21S11KEX MODEL : CF-20/21T20K/20T22KX MODEL : CF-20K51KEX MODEL : CF-20/21F60K/KX CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Sep.,2001 NATVRAL ALGORITHM P/NO : 3828VD0104L Printed in Korea...
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Page 2: Table Of Contents
CONTENTS Contents ......................... 2 Safety Precautions ....................3 Servicing Precautions ..................4 Specifications ..................... 6 Description of Controls .................. 7 Disassembly Instructions ................10 Adjustment ......................11 Purity & Convergence Adjustment ............14 Block Diagram ......................17 Exploded View ....................18 Exploded View Parts List ................19 Replacement Parts List ................ -
Page 3: Safety Precautions
SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. -
Page 4: Servicing Precautions
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static NOTE: If unforeseen circumstances create conflict between the electricity. - Page 5 c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it Removal/Replacement there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board component lead and the foil.
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Page 6: Specifications
SPECIFICA TIONS Note : Specification and others are subject to change without notice for improvement. ¡ Video input system: PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G) SECAM-B/G, D/K,L/L’ 32.9MHz (I/I) NTSC M 32.4MHz (D/K) NTSC 4.43 34.4MHz (M) ¡ Intermediate Frequency (Unit : MHz) ¡... -
Page 7: Description Of Controls
DECRIPTIONS OF CONTROLS All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set. Remote control handset Before you use the remote control handset, please install the bat- teries. - Page 8 10. MUTE switches the sound on or off. 11. TV/AV selects TV or AV mode. clears the menu from the screen. switches the set on from standby. 12. I/II/ (option) selects the language during dual language broadcast. (option) selects the sound output. POWER MUTE 13.
- Page 9 Front panel Shown is a simplified representation of front or side panel. Here shown may be somewhat different from your set. VIDEO VIDEO OK F F VOL G G E E PR D D § § ON/OFF r r MENU VIDEO AUDIO AUDIO...
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Page 10: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS Important note Chassis Assy Removal This set is disconnected from the power supply through the Grasp both side of Frame and pull it backward smoothly. converter transformer. An isolating transformer is necessary for service operations on the primary side of the converter transformer. -
Page 11: Adjustment
ADJUSTMENT Safety Precautions Option Code Function Remark ¡ 1. It is safe to adjust after using insulating transformer W/O TBS between the power supply line and chassis input to WITH TBS prevent the risk of electric shock and protect the instrument. - Page 12 X=288¡ 8, Y=295¡ X=272¡ 8, 11,000K) 5) Press the OK(¡Æ ) button to memorize the data. Status Initial Data Remark Tuner P/N 6700VPF009G 6700VPF016A Marker LG Innotek(W/S TUNER) DAEWOO(W/S TUNER) 2.7¡ 0.05V AGC Voltage 2.7¡ 0.05V Tuner P/N 6700VPF009S BLO-R LG Innotek(TBS TUNER)
- Page 13 2. Deflection Initial Setup Data Status Default 21" FLAT S/S 21" FLAT LG 3. Deflection Adjustment Procedure VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.
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Page 14: Purity & Convergence Adjustment
PURITY & CONVERGENCE ADJUSTMENT Caution: 5. Reconnect the internal degaussing coil. Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. 6. Position the beam bender locking rings at the 9 o'clock However, the effects of adjacent receiver components, or position and the other three pairs of tabs (2,4 and 6 pole replacement of picture tube or deflection yoke may require the magnets) at the 12 o'clock position. - Page 15 1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL COLOR CIRCLES COLOR CIRCLES MAGNETS 8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a.
- Page 16 ROTATION DIRECTION RING MOVEMENT OF RED OF BOTH TABS PAIRS AND BLUE BEAMS OPPOSITE POLE SAME OPPOSITE POLE SAME UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF...
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Page 17: Block Diagram
Option Part ST-BY IIC Bus Line INPUT ¡Ü MNT Audio Out(Mono) TRANS (110~240V) TV Audio Out (CL Mono) (3W Opt) SPK. SPK. IC651 R.G.B AMP. & LA7016(Mono Opt) TV Audio(From UOC #28) CPT DRIVE / Game Audio (From HIC01) AUDIO B+ 15 18 (TDA6107Q) IC631... -
Page 18: Exploded View
EXPLODED VIEW : 20/21S11KEX - 18 -... -
Page 19: Exploded View Parts List
The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 20" 21" 343-B52A 343-B52A SUPPORTER,PCB 112-C20S 112-C21G CPT SET 120-D38F 120-D38F SPEAKER 150-D02Y 150-D02X COIL,DEGAUSSING 170-A01D 170-A01D LEAD SET,CPT EARTH 174-009E 174-009E... - Page 20 EXPLODED VIEW : 20/21T20KX OPTION - 20 -...
- Page 21 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 20" 21" 112-C20S 112-C21G CPT SET 120-C93G 120-C93G SPEAKER 6400VA0019C 6400VA0019C SPEAKER 150-D02Y 150-D02X COIL,DEGAUSSING 170-A01D 170-A01D LEAD SET,CPT EARTH 174-009E 174-009E...
- Page 22 EXPLODED VIEW : 20K51KEX - 22 -...
- Page 23 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 112-C20S CPT SET A48ECR141X(S/S, DARK W/ITC LGE 120-C77G SPEAKER,FULLRANGE C122P02K1459 8 OHM 1 150-D02Y COIL,DEGAUSSING CU 20Ó 60TURN 15 OHM 170-A01D LEAD SET,CPT EARTH 174-009E...
- Page 24 EXPLODED VIEW : 20/21F60KX OPTION - 24 -...
- Page 25 The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 20" 21" 343-B52A 343-B52A SUPPORTER,PCB 112-C20S 112-C21G CPT SET 120-C93G 120-C93G SPEAKER,GENERAL 150-D02Y 150-D02X COIL,DEGAUSSING 170-A01D 170-A01D LEAD SET,CPT EARTH 174-009E 174-009E...
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Page 26: Replacement Parts List
The components identified by mark critical for safety. REPLACEMENT PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION ZD501 0DZ820009BF DIODE,ZENER GDZJ8.2B TP GRANDE DO34 0.5W ZD601 0DZ910009BD DIODE,ZENER GDZJ9.1B TP GRANDE DO34 0.5W IC01 0IZZVC0020D IC,PHILIPS 64P ST (EU)TXT 019A... - Page 27 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
- Page 28 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film critical for safety. the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
- Page 29 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
- Page 30 DESCRIPTION LOCA. NO PART NO DESCRIPTION R628 0RD0331H609 3.3 OHM 1/2 W 5.00% TA52 SW06 140-315A SWITCH,TACT SKHV17910B LG C&D NON 12V R631 0RD1302F609 13K OHM 1/6 W 5.00% TA52 SW801 6600VM2002A SWITCH,PUSH SDKEA3 IEC 250V 8A HORIZO R632 0RD1000F609 100 OHM 1/6 W 5.00% TA52...
- Page 31 P/NO:3854VA0083B-S 2001.04.20...
- Page 32 PRINTED CIRCUIT BOARD WIRING DIAGRAM COMPONENT LOCATION GUIDE MAIN & CPT C01..B4 C403 ..G4 C607..B3 C811 ..G3 F812 ..E2 L801 ..E4 R05..B4 R218 ..D5 R554 ..D4 R820..F4 C02..B4 C404 ..G4 C611..B3 C812..E2 F801A ..G2 L802 ..E3 R06..B3 R219 ..D5 R555 ..D4 R822..F4 C03..B3 C405 ..G4...
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Page 33: Svc. Sheet
SVC. SHEET : 3854V A0083A-S SVC. SHE...